[longassname]

I would take diagnosing this seriously. Erroring on the side of not fixing this could be very costly. I think with the reported age of this transmission that if the reverse clutch is bad at this stage it would be safe to replace only the reverse clutch and the high clutch and high clutch drum which are the very first things in the transmisison case when you pull the pump off. This is much less involved and much less expensive than a full rebuild. In fact, while it's kind of a long drive it's probably worth it if it does turn out to be your reverse clutch--if you were to take it to SVXfiles in W. Virginia he would be able to supply you with the better style high clutch drum and I could supply him with the parts to upgrade the high clutch and reverse clutch and would be willing to do so for you.